<< >> NASA ASRS Report 306381, May 1995

Small aircraft same altitude assigned had less than standard separation from small transport. System error.

Attributes
ACN	306381
Time
Date	199505
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : abe
State Reference	PA
Altitude	msl bound lower : 5000 msl bound upper : 5000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Route In Use	enroute : direct enroute airway : abe
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air taxi
Make Model Name	Caravan 1 208A
Operating Under FAR Part	Part 135
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : developmental
Experience	controller radar : 9
ASRS Report	306381
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 9000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

C172 was given direct avp at 5000 ft. C208 was 25 mi north of abe given direct abe. I was busy with other aircraft and I thought the C208 was at 6000 ft. When I noticed the situation I had already lost separation.

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Original NASA ASRS Text

Title: SMA SAME ALT ASSIGNED HAD LTSS FROM SMT. SYS ERROR.

Narrative: C172 WAS GIVEN DIRECT AVP AT 5000 FT. C208 WAS 25 MI N OF ABE GIVEN DIRECT ABE. I WAS BUSY WITH OTHER ACFT AND I THOUGHT THE C208 WAS AT 6000 FT. WHEN I NOTICED THE SIT I HAD ALREADY LOST SEPARATION.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.